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White Square D QOU320 three-pole miniature circuit breaker with toggle actuators

SQUARE D

SQUARE D QOU320 20A 3 Pole 120/240V AC Circuit Breaker

SKU CH-VKWH-JABFH

Three-pole miniature breaker rated 20 A at 120/240 V AC with 10 kA interrupting capacity for QO load centres

  • 20 A three-pole protection for 120/240 V AC circuits
  • 10 kA interrupting rating handles high fault currents
  • Toggle actuator gives clear on/off indication
  • Reversible slotted box lugs simplify line or load wiring
  • QO series compatibility fits existing Square D panelboards

Three-Pole Protection for QO Panels

The SQUARE D QOU320 is a 20 A miniature circuit breaker built for three-phase 120/240 V AC systems. It fits QO-series load centres and carries a 10 kA interrupting rating at that voltage. The breaker also accepts 48 V DC circuits.

Reversible Lugs Simplify Wiring

Slotted box lugs on both line and load sides are reversible so the installer can terminate conductors from either direction. Surface or DIN-rail mounting gives flexibility inside the enclosure. No extra accessories or software are included in the package.

10 kA AIR Rating Determines Fit

The maximum ampere interrupting rating of 10 kA at 120/240 V AC is the single figure that decides whether this breaker matches the available fault current. Buyers whose panels require a higher AIR rating cannot use this model.

Highlights

  • 20 A three-pole protection for 120/240 V AC circuits
  • 10 kA interrupting rating handles high fault currents
  • Toggle actuator gives clear on/off indication
  • Reversible slotted box lugs simplify line or load wiring
  • QO series compatibility fits existing Square D panelboards

Specifications

BrandSQUARE D

Questions about this item

Will the slotted box lug terminals on this QOU320 breaker need periodic retightening?

The reversible line and load lugs are designed to maintain a secure connection without scheduled retightening under normal conditions.

What is the maximum fault current this 20 A three-pole breaker can safely interrupt?

The QOU320 carries a 10 kA interrupting rating at 120/240 V AC, so sustained faults above that level would exceed its capacity.

How much heat does the breaker generate when carrying its full 20 A load continuously?

At 20 A the device operates within its 100 A frame thermal limits; no additional cooling is required for continuous duty in a compatible QO panel.

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